Watchmaker&#39;s gauge



Aug.14, 1928. I 1,681,121

- R. LARSEN WATCHMAKERS GAUGE Filed Oct. 1927 INVENTOR fiollertlavsm BY M.

ATTORNEY Patented Aug. 14, 1928. r

j 1,681,121 PATENT i OFFICE.

ROBERT LARSEN, on NEW YORK, N. Y.

wATcHMAxEws GAUGE.

I r 1 Application filed October 6, 1927. Serial No. 224,475.

My invention rel'ates to a i vatchmakers au e. and articular] to a al e forasceri n P a taining the dimensions of a given size balance staff in repairing watches where the I staff has been broken. The'stafi' is formed with end bearing cones and breakage occurs ad acent to the base ofeither cone, making it difficult with ordinary calipers or gauge instruments to ascertain accurately certain dimensions of thebalance staff.

The general object; of my invention is to provide awatchmakers gauge of a character that will enable theprecise measurements to be obtained even though-one of the end bearings has become fbroken. 1

.A further important object of the invention is to provide a watchmakersgauge or calipers. that will enable the determination not only of the total length of the balance stallv but also the distance between an end of the stall and the shoulder with which the stall is formed.

i The nature of my jinvention and its disp tinguishing features andv advantages will clearly appear as the description proceeds.

Reference is tobe had to the accompanying drawing forming a part of this specification, it being understood that the drawing is merelyillustrative of one example of the invention. 7

Figure 1 is an elevation of awatchmakers gauge embodying my invention.

position in the gauge.

Figure 5 is a detail with the terminal of one arm of the gauge in section and an end of the balance stafi with its cone bearing terminal in elevation.

In carrying out my invention in practice in accordance withthe illustrated example,

two side arms 10, 11, are provided, pivotally connected as usual by a transverse screw 12,

- said screw 12 passing through one side disc 13 having a lateral pin 14 which is accommodated in a pin hole 15 ina corresponding.

disc 16 at the opposite side of the gauge. A spring 17 extending from one arm, as 10. bears at its free end against the opposite arm 11, tending to bring the operative ends of'tlie gauge, toward each other. Integral or otherwise made rigid with one arm 10 is an arcuate graduated member'19 over which the pointed index terminal 20 of the arm 11 is adapted to be moved for indicating by thegraduations of said member 19 the dimension or the total length of a balance staff. On the member 19 at the free end thereof is a stop member 21 against which the arm 11 may contact to limit its movement in one direction. u l v Coordinated with the arms lOand l1 and the graduated member 19 is an auxiliary gauge arm 22 held by the pivot 12 and havmg an inwardly directed indicating pointer 23 thereon, between which pointer and the adjacent side of the gauge arm 22 is asight opening 24, said pointer 23 and the sight opening 2-1t being adapted to be moved over the graduations of the member 19.

passes, and 118 indicates the member on arm 22 through V which the ,SZLlCl screw also asses.

The' 'caliper or gaugingends of the arms 10, 11 are directed laterally inward toward each other, as at 25, 26, and said inwardly" directed ends 25, 26, are provided with gauge members 27, 28, adapted to contact with each other or to be separated the i'equ red distance for-gauging a balance staff.

In Figure 4 the letter'A indicates a balaiice stall, B a broken pin or cone hearing at, one end of said stall, and C (Figures 4: and 5) indicates an unbroken. cone hearing at the opposite end of the staff. The letter VD indicates a shoulder on the usual balance staff, and to be hereinafter referred to. The letter a in Figure 5 indicates the line of breakage adjacent the base of the cone bearing C. 11, see Figure 5, is formed a recess 29 to receive the major portion of the cone bearing so that the contact is made on a line corresponding with the usual line of break age of the bearing. The numeral 30 indi- In the terminal 28 of the arm I cates the gauging or caliper end of the auxiliary gauge arm 22.

y In using my improved gauge, a broken balance stall may be positioned between the terminals 27, 28, as shown in Figure 4:, the

one terminal 27 contacting with the broken bearing B at the line corresponding withthe line a in Figure 5. The opposite terniinal 28'is engaged w'ith'the opposite end lie of the balance stafl A by entering the end I gives the dimension of the staff or total length thereof between the bearing line a of the unbroken pin .and the corresponding end of the broken pin B. hen the balance stail', which is made in various sizes, is positioned between the terminals 27, 28, as described, the indicating pointer will indi- -ate on the graduated arm 19 the gauge of the balance staii' being measured. To ascertain the distance between the end of a broken cone bearing or pin 13 and the shoulder 1) (see Figure a), one terminal 27 is brought against the broken bearing B and the terminal 30 of the auxiliary gauge arm is brought into contact with the shoulder I), whereby the pointer 23 will indicate the length between said broken end of the cone bearing and the said shoulder D.

I would state furthermore that while the illustrated example constitutes a practical embodiment of my invention, I do not limit myself strictly to the exact details herein illustrated, since, manifestly, the same can be considerably varied without departure from the spirit of the invention as defined in the appended claims.

I claim:

1. A device of the class described, including two arms pivoted to each other and having oppositely disposed gauge members at one end, a transverse graduated member on one of the arms at the opposite end, and an indicating member on the other arm at said opposite end to traverse the graduations of said indicating member, one of the said gauge members having a recess to receive a bearing of a balance stall, the other member being adapted to engage the opposite end of the stall'.

2. A \vatclnnakers gauge having arms pivoted to move toward and from each other, gauge members on said arms at one end, a transverse graduated member on one of said pivoted arms at the opposite end, and an auxiliary gauge arm adapted to move toward and coact with the gauge member on one of the first-mentioned arms and having an indicating member adapted to move over said graduated member.

A device of the class described, including two gauge arms having engaging members atone end of said device for gauging the length of a balance stafi', indicating means at the opposite end of the device, and a third arm constituting an auxiliary gauge element in a plane at the side of the firstmeutioned plane, said auxiliary gauge element being adapted to coact with one of said first-mentioned gauge arms to engage an intermediate shoulder on a balance staif, said auxiliary element having an indicating device to coact with said indicating means.

Signed at New York in the county of New York and State of New York this 4th day of October, A. D. 1927.

ROBERT LARSEN. 

